5/28/2008 @ 6:00PM

In Pictures: 12 Stem Cell Revolutionaries

James A. Thomson

University of Wisconsin School of Medicine/Cellular Dynamics International

Cell: Embryonic stem cell, induced pluripotent cell

Disease: Drug toxicity, basic research

Approach: His company, Cellular Dynamics, is using embryonic stem cells to make heart cells for drug toxicity testing. Thomson’s lab is exploring the basic science of what makes embryonic and adult cells different.